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TO: Mayor Richard C. Irvin
FROM: Jim Birchall, Superintendent Fleet & Facilities Maintenance
DATE: May 10, 2021
SUBJECT:
Aurora Police Headquarters Cooling Tower Renovation
PURPOSE:
To ensure the continual proper function of the Aurora Police Headquarters HVAC system.
BACKGROUND:
Air conditioning at the Aurora Police Headquarters, located at 1200 E Indian Trail, is achieved through the use of a water-cooled air chiller system. Air chillers are typically utilized in large commercial applications due to greater operating efficiency compared to other methods.
Cooling towers are a critical component of air chiller systems that perform the task of ejecting extracted heat to the exterior of the building. The internal hot water basin and distribution box in the existing roof-mounted cooling tower is badly corroded and could soon fail, resulting in the air chiller system not functioning correctly. This in turn would cause intolerably high interior air temperatures.
DISCUSSION:
In order to ensure the continued function of the air chiller system, the cooling tower requires renovation including replacement of the corroded hot water basin and distribution box assembly. Unlike the existing assembly, the replacement will be constructed of stainless steel which is stronger and naturally averse to corrosion.
F.H. Paschen, S.N. Nielsen & Associates LLC has proposed to renovate the cooling tower through the City of Aurora Job Order Contracting Program (JOC) for $110,119.16. The quotation also includes the installation of a second access ladder to facilitate regular periodic maintenance, along with the inspection and adjustment of the remaining components. Work will be performed by State Mechanical Services of Aurora, IL who submitted the lowest most responsible bid.
$8,288.54 (7%) of the quoted price will be refunded to the City as prescribed by the JOC.
The JOC proposal and a virtual image of the cooling tower are attached.
This project was an approved 2...
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